Vibrator



Oct. 27, 1931. E. FICKETT ET AL 1,829,441

VIBRATOR Filed Nov. 25, 1929 2 Sheets-Sheet 2 flvew/ 1. Wake 22FT/751mm, V f

latenterl Oct. 27, 1931 UNlTE DQST-ATES PATENT? OFFICE ERNEST L.FICKETT; F FITCH-BURG, MASSACHUSETTS, AND ALBERT W. MUNSELL,OI'TEA-NECK, NEWERSEY, ASSIGNORS, BY ASSIGNMENTS, T0 SAID ALBERT W.

MUN SELL vmne'ron Application filed November 25, 1929. Serial No.409,475.

This invention relates to a vibrator particularly adapted for tampingconcrete by vibration and also capable of use for tamping andconsolidating other materials, such as molding sand and the like.

The main object of this invention is to provide an effective means forcausing the concrete or other granular material to flow into the cornersand an les of the forms, patterns the like in which it is enclosed andto completely imbed any reinforcing steel that may be present byconsolidation of the aggregates and cement by the operation of vibrationor jarring; also to drive 03 any excess Water or release any entrainedair so as to settle th granular material into its densest condition andmake it as near as possible an absolute solid and to provide a mechanismadapted to act by compressed air or other fluid to produce rapidvibrations by the utilization of a rotor mounted to rotate on an axisand having its center of gravity arranged eccentrically.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings in which Fig. l isan end view of adevice constructed in accordance with this inventionshowing the principal parts in section on a plane transverse to the axisof rotation of the rotor;

Fig. 2 is a side view of the same;

Fig. 3 is a sectional view on the line 33 of Fig. 1;

Fig. 4: is a sectional view on the line 44 of Fig. 2;

Figs. 5, 6 and 7 are sectional views through the casing but showing therotor in elevation and in three different positions, and

Fig. 8 is a plan showing one way of applying the vibrator to a concreteform.

The machine itself, as shown, comprises a tamper foot 10 attached by asuitable length of pipe 11 to a main casing or frame 12. Into the top ofthis casing extends a pipe 13 through which compressed air or otheroperating fluid can be introduced. The air enters the casing 12 in whatmay be considered two passages 14 and 15. The passage 14: ap-

plies the pressure of the actuating fluid at; all

times, and of course directly, to a sliding abutment 16. Through thepassage 15 the air enters a space or chamber 17in theinterior of thecasing, which is shown circular and preferably cylindrical in form. Inthis casing is the rotor 18 mounted torotate on a shaft 19 which iscentrally located in i the chamber 17 but the rotor iseccentricallylocated therein so that it will substantially contact withthe surface ofthespace 17 at one point, advancing around the same as therotor rotates. For the purpose of enablingthe rotor to lVOlWe freelyandmaintain alignment it-is provided with an anti-friction bearing 20 onthe shaft '19.

It will be observed that on account of the air pressure on the abutment16, itwill be kept in contact with the rotor by yielding but strongpressure at all times. The passage or port 15 is the admission port. Theexhaust port 22 is provided on the opposite side of the abutment valve16. An oil reservoir 23 is also provided in the casing 12 which isfilled and closed by any suitable means such as a pipe plug. The oil inthis reservoir is transferredto the inlet passage 15 and regulated by aneedle valve 24 so as to follow all around the parts that have beendescribed.

The device can be used in two ways. It can be manually operated, so tospeak, by holding it in the hands with the-tamper foot 10 againstthe-concrete forum-mold, blank, or the like. On the other hand thecasing 12 is shown as provided with serrations 25 along one side and thecasing is clamped against the structure of the form containing theconcrete or the like in such position that the points of the serrationsimpinge on a wooden member thereof. Rods or other suitable clamps 26 arepassed through holes 27 in a pair of opposite cover plates 28 andattached to the concrete form in any desired way. Then the vibrationsproduced by the rotor will be transmitted directly and positivelywithout holding the machine manually.

The operationwill be understood byreference to Figs. '5, 6 and 7. In theposition shownin-Fig. 5 air is being admitted through the intake portandis pressing on the abutment va-lve, of course, at all times. Thereforeit will be seen thatno air can pass in a face but eccentrically locatedthereon and counter-clockwise 7 through the exhaust port; The space onthe direction and escape exhaustside is. all open through the exhaustportto-atmospheric air. The rotor. clears the inside of the inner wallof the space 17 vby a few thousandths of an inchand being lubricated,itpractically touches it. Nowthe air presses in all directions and the'efiective surface of the rotor in the small space at the right of theabutment valve 16 is presented at right angles to the axis of the shaft19 upon which surface theair pressure is free to act, thereby producinga-turning moment onthe rotor.

When the parts get to, the position shown in V Fig. 6 this moment'isincreased. It is still having its edge, at the greatest distance fromits center of rotation, substantially in contact withthe wall of thechamber, whereby the rotor initsrrotation moves'toward and from saidsurface, an abutment in contact with the rotor to prevent passage offluid backwardly around it and means for, introducing'fluidabutmentunder pressure on one side .of the for turning'the rotor.

' y In testimony whereof we have hereunto affixed our signatures. v

j V ERNEST .L. FICKE'TT MUNSELL.

present in the positionshown" in Fig.5 7 7 Therefore the rotorwilloperate until itcomes 1 to a dead center and the parts are so designed ithat the rotor will have suiiicient inertia to V carryit over the deadcenter and then the process is repeated. Of course, when the rotor rhaust port-is beginning to open to allow the air to escape thathas beenused in running is on the intake side; This is'a deadcenter.

therotor and practically" no projecting areao I "If the device isstopped atthi's point itis necessary to jar it from the outsideso thattherotor willfall into a'position bygravity' V from which it can bestarted again. .The 1 r center of mass of the rotor is outside itscenter of rotat on. In other words 1t 1s an eccentric.

Therefore the desiredyibrations are produced V and transmitted to thearticle upon which it is operating. 1

' This constitutesa very simple deyiceout anymoving inlet or outletValves except for the granular'material as desired; It is readilyportable; Ordinarilywit is used in erticalposition as shown but that isnot essentiaL- i Q j Although we have illustrated anddescribed onlyasingle form of the invention and two ways 'of'using it, we are aware ofthe'fact that modifications can be made therein by any per- 7 vsonskilled in the art without departingafrom 7 7 combination-of a casinghaving serrations limited {in the scope of the invention as expressed inthe: claim; ;Therefore we do not wish to be thisrespectbut what .:we doIn a' vibrator for thepurpose des'cribed,the f along one side,meansforsecuring the casing to the surface of 'a concrete form andforcing the serrations into said surface-for transs 7 V mitting themotion of the casi'n thereto,'said V cas ng ha-Vmgja c rcular'chamertherein, a

rotor mounted to -rotate about aihorizontal l '7 axis in, saidchamberparallel with said suri

